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pigweed/third_party/github/32blit/32blit-sdk/62ca232b3aef49246f3de29cdee633e370ef9293/./32blit-stm32/Src/usbd_msc_scsi.c
blob: fb35f54301f19898623dfb6d98e19adc61180c8c [file]
/**
******************************************************************************
* @file usbd_msc_scsi.c
* @author MCD Application Team
* @brief This file provides all the USBD SCSI layer functions.
******************************************************************************
* @attention
*
* <h2><center>&copy; Copyright (c) 2015 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under Ultimate Liberty license
* SLA0044, the "License"; You may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* www.st.com/SLA0044
*
******************************************************************************
*/
/* BSPDependencies
- "stm32xxxxx_{eval}{discovery}{nucleo_144}.c"
- "stm32xxxxx_{eval}{discovery}_io.c"
- "stm32xxxxx_{eval}{discovery}{adafruit}_sd.c"
EndBSPDependencies */
/* Includes ------------------------------------------------------------------*/
#include "usbd_msc_bot.h"
#include "usbd_msc_scsi.h"
#include "usbd_msc.h"
#include "usbd_msc_data.h"
#include "USBManager.h"
/** @addtogroup STM32_USB_DEVICE_LIBRARY
* @{
*/
/** @defgroup MSC_SCSI
* @brief Mass storage SCSI layer module
* @{
*/
/** @defgroup MSC_SCSI_Private_TypesDefinitions
* @{
*/
/**
* @}
*/
/** @defgroup MSC_SCSI_Private_Defines
* @{
*/
/**
* @}
*/
/** @defgroup MSC_SCSI_Private_Macros
* @{
*/
/**
* @}
*/
/** @defgroup MSC_SCSI_Private_Variables
* @{
*/
extern USBManager g_usbManager;
/**
* @}
*/
/** @defgroup MSC_SCSI_Private_FunctionPrototypes
* @{
*/
static int8_t SCSI_TestUnitReady(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_Inquiry(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_ReadFormatCapacity(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_ReadCapacity10(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_RequestSense(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_StartStopUnit(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_AllowMediumRemoval(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_ModeSense6(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_ModeSense10(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_Write10(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_Read10(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_Verify10(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params);
static int8_t SCSI_CheckAddressRange(USBD_HandleTypeDef *pdev, uint8_t lun,
uint32_t blk_offset, uint32_t blk_nbr);
static int8_t SCSI_ProcessRead(USBD_HandleTypeDef *pdev, uint8_t lun);
static int8_t SCSI_ProcessWrite(USBD_HandleTypeDef *pdev, uint8_t lun);
/**
* @}
*/
/** @defgroup MSC_SCSI_Private_Functions
* @{
*/
/**
* @brief SCSI_ProcessCmd
* Process SCSI commands
* @param pdev: device instance
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
int8_t SCSI_ProcessCmd(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *cmd)
{
int8_t nResult = 0;
switch (cmd[0])
{
case SCSI_TEST_UNIT_READY:
nResult = SCSI_TestUnitReady(pdev, lun, cmd);
break;
case SCSI_REQUEST_SENSE:
nResult = SCSI_RequestSense(pdev, lun, cmd);
break;
case SCSI_INQUIRY:
nResult = SCSI_Inquiry(pdev, lun, cmd);
break;
case SCSI_START_STOP_UNIT:
nResult = SCSI_StartStopUnit(pdev, lun, cmd);
break;
case SCSI_ALLOW_MEDIUM_REMOVAL:
nResult = SCSI_AllowMediumRemoval(pdev, lun, cmd);
break;
case SCSI_MODE_SENSE6:
nResult = SCSI_ModeSense6(pdev, lun, cmd);
break;
case SCSI_MODE_SENSE10:
nResult = SCSI_ModeSense10(pdev, lun, cmd);
break;
case SCSI_READ_FORMAT_CAPACITIES:
nResult = SCSI_ReadFormatCapacity(pdev, lun, cmd);
break;
case SCSI_READ_CAPACITY10:
nResult = SCSI_ReadCapacity10(pdev, lun, cmd);
break;
case SCSI_READ10:
nResult = SCSI_Read10(pdev, lun, cmd);
break;
case SCSI_WRITE10:
nResult = SCSI_Write10(pdev, lun, cmd);
break;
case SCSI_VERIFY10:
nResult = SCSI_Verify10(pdev, lun, cmd);
break;
default:
SCSI_SenseCode(pdev, lun, ILLEGAL_REQUEST, INVALID_CDB);
nResult = -1;
break;
}
return nResult;
}
/**
* @brief SCSI_TestUnitReady
* Process SCSI Test Unit Ready Command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_TestUnitReady(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *)pdev->pClassData;
/* case 9 : Hi > D0 */
if (hmsc->cbw.dDataLength != 0U)
{
SCSI_SenseCode(pdev, hmsc->cbw.bLUN, ILLEGAL_REQUEST, INVALID_CDB);
return -1;
}
if (((USBD_StorageTypeDef *)pdev->pUserData)->IsReady(lun) != 0)
{
SCSI_SenseCode(pdev, lun, NOT_READY, MEDIUM_NOT_PRESENT);
hmsc->bot_state = USBD_BOT_NO_DATA;
return -1;
}
hmsc->bot_data_length = 0U;
return 0;
}
/**
* @brief SCSI_Inquiry
* Process Inquiry command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_Inquiry(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
uint8_t *pPage;
uint16_t len;
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *)pdev->pClassData;
if (params[1] & 0x01U)/*Evpd is set*/
{
len = LENGTH_INQUIRY_PAGE00;
hmsc->bot_data_length = len;
while (len)
{
len--;
hmsc->bot_data[len] = MSC_Page00_Inquiry_Data[len];
}
}
else
{
pPage = (uint8_t *)(void *) & ((USBD_StorageTypeDef *)pdev->pUserData)->pInquiry[lun * STANDARD_INQUIRY_DATA_LEN];
len = (uint16_t)pPage[4] + 5U;
if (params[4] <= len)
{
len = params[4];
}
hmsc->bot_data_length = len;
while (len)
{
len--;
hmsc->bot_data[len] = pPage[len];
}
}
return 0;
}
/**
* @brief SCSI_ReadCapacity10
* Process Read Capacity 10 command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_ReadCapacity10(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *)pdev->pClassData;
if (((USBD_StorageTypeDef *)pdev->pUserData)->GetCapacity(lun, &hmsc->scsi_blk_nbr, &hmsc->scsi_blk_size) != 0)
{
SCSI_SenseCode(pdev, lun, NOT_READY, MEDIUM_NOT_PRESENT);
return -1;
}
else
{
hmsc->bot_data[0] = (uint8_t)((hmsc->scsi_blk_nbr - 1U) >> 24);
hmsc->bot_data[1] = (uint8_t)((hmsc->scsi_blk_nbr - 1U) >> 16);
hmsc->bot_data[2] = (uint8_t)((hmsc->scsi_blk_nbr - 1U) >> 8);
hmsc->bot_data[3] = (uint8_t)(hmsc->scsi_blk_nbr - 1U);
hmsc->bot_data[4] = (uint8_t)(hmsc->scsi_blk_size >> 24);
hmsc->bot_data[5] = (uint8_t)(hmsc->scsi_blk_size >> 16);
hmsc->bot_data[6] = (uint8_t)(hmsc->scsi_blk_size >> 8);
hmsc->bot_data[7] = (uint8_t)(hmsc->scsi_blk_size);
hmsc->bot_data_length = 8U;
return 0;
}
}
/**
* @brief SCSI_ReadFormatCapacity
* Process Read Format Capacity command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_ReadFormatCapacity(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *)pdev->pClassData;
uint16_t blk_size;
uint32_t blk_nbr;
uint16_t i;
for (i = 0U; i < 12U ; i++)
{
hmsc->bot_data[i] = 0U;
}
if (((USBD_StorageTypeDef *)pdev->pUserData)->GetCapacity(lun, &blk_nbr, &blk_size) != 0U)
{
SCSI_SenseCode(pdev, lun, NOT_READY, MEDIUM_NOT_PRESENT);
return -1;
}
else
{
hmsc->bot_data[3] = 0x08U;
hmsc->bot_data[4] = (uint8_t)((blk_nbr - 1U) >> 24);
hmsc->bot_data[5] = (uint8_t)((blk_nbr - 1U) >> 16);
hmsc->bot_data[6] = (uint8_t)((blk_nbr - 1U) >> 8);
hmsc->bot_data[7] = (uint8_t)(blk_nbr - 1U);
hmsc->bot_data[8] = 0x02U;
hmsc->bot_data[9] = (uint8_t)(blk_size >> 16);
hmsc->bot_data[10] = (uint8_t)(blk_size >> 8);
hmsc->bot_data[11] = (uint8_t)(blk_size);
hmsc->bot_data_length = 12U;
return 0;
}
}
/**
* @brief SCSI_ModeSense6
* Process Mode Sense6 command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_ModeSense6(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *)pdev->pClassData;
uint16_t len = 8U;
hmsc->bot_data_length = len;
while (len)
{
len--;
hmsc->bot_data[len] = MSC_Mode_Sense6_data[len];
}
return 0;
}
/**
* @brief SCSI_ModeSense10
* Process Mode Sense10 command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_ModeSense10(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
uint16_t len = 8U;
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *)pdev->pClassData;
hmsc->bot_data_length = len;
while (len)
{
len--;
hmsc->bot_data[len] = MSC_Mode_Sense10_data[len];
}
return 0;
}
/**
* @brief SCSI_RequestSense
* Process Request Sense command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_RequestSense(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
uint8_t i;
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *)pdev->pClassData;
for (i = 0U ; i < REQUEST_SENSE_DATA_LEN; i++)
{
hmsc->bot_data[i] = 0U;
}
hmsc->bot_data[0] = 0x70U;
hmsc->bot_data[7] = REQUEST_SENSE_DATA_LEN - 6U;
if ((hmsc->scsi_sense_head != hmsc->scsi_sense_tail))
{
hmsc->bot_data[2] = hmsc->scsi_sense[hmsc->scsi_sense_head].Skey;
hmsc->bot_data[12] = hmsc->scsi_sense[hmsc->scsi_sense_head].w.b.ASCQ;
hmsc->bot_data[13] = hmsc->scsi_sense[hmsc->scsi_sense_head].w.b.ASC;
hmsc->scsi_sense_head++;
if (hmsc->scsi_sense_head == SENSE_LIST_DEEPTH)
{
hmsc->scsi_sense_head = 0U;
}
}
hmsc->bot_data_length = REQUEST_SENSE_DATA_LEN;
if (params[4] <= REQUEST_SENSE_DATA_LEN)
{
hmsc->bot_data_length = params[4];
}
return 0;
}
/**
* @brief SCSI_SenseCode
* Load the last error code in the error list
* @param lun: Logical unit number
* @param sKey: Sense Key
* @param ASC: Additional Sense Key
* @retval none
*/
void SCSI_SenseCode(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t sKey, uint8_t ASC)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *)pdev->pClassData;
hmsc->scsi_sense[hmsc->scsi_sense_tail].Skey = sKey;
hmsc->scsi_sense[hmsc->scsi_sense_tail].w.ASC = ASC << 8;
hmsc->scsi_sense_tail++;
if (hmsc->scsi_sense_tail == SENSE_LIST_DEEPTH)
{
hmsc->scsi_sense_tail = 0U;
}
}
/**
* @brief SCSI_StartStopUnit
* Process Start Stop Unit command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_StartStopUnit(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *) pdev->pClassData;
hmsc->bot_data_length = 0U;
if (params[4] & 1)
g_usbManager.SetState(USBManager::usbsMSCMounting);
else
g_usbManager.SetState(USBManager::usbsMSCUnmounting);
return 0;
}
static int8_t SCSI_AllowMediumRemoval(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *) pdev->pClassData;
hmsc->bot_data_length = 0U;
return 0;
}
/**
* @brief SCSI_Read10
* Process Read10 command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_Read10(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *) pdev->pClassData;
if (hmsc->bot_state == USBD_BOT_IDLE) /* Idle */
{
/* case 10 : Ho <> Di */
if ((hmsc->cbw.bmFlags & 0x80U) != 0x80U)
{
SCSI_SenseCode(pdev, hmsc->cbw.bLUN, ILLEGAL_REQUEST, INVALID_CDB);
return -1;
}
if (((USBD_StorageTypeDef *)pdev->pUserData)->IsReady(lun) != 0)
{
SCSI_SenseCode(pdev, lun, NOT_READY, MEDIUM_NOT_PRESENT);
return -1;
}
hmsc->scsi_blk_addr = ((uint32_t)params[2] << 24) |
((uint32_t)params[3] << 16) |
((uint32_t)params[4] << 8) |
(uint32_t)params[5];
hmsc->scsi_blk_len = ((uint32_t)params[7] << 8) | (uint32_t)params[8];
if (SCSI_CheckAddressRange(pdev, lun, hmsc->scsi_blk_addr,
hmsc->scsi_blk_len) < 0)
{
return -1; /* error */
}
hmsc->bot_state = USBD_BOT_DATA_IN;
/* cases 4,5 : Hi <> Dn */
if (hmsc->cbw.dDataLength != (hmsc->scsi_blk_len * hmsc->scsi_blk_size))
{
SCSI_SenseCode(pdev, hmsc->cbw.bLUN, ILLEGAL_REQUEST, INVALID_CDB);
return -1;
}
}
hmsc->bot_data_length = MSC_MEDIA_PACKET;
return SCSI_ProcessRead(pdev, lun);
}
/**
* @brief SCSI_Write10
* Process Write10 command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_Write10(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *) pdev->pClassData;
uint32_t len;
if (hmsc->bot_state == USBD_BOT_IDLE) /* Idle */
{
/* case 8 : Hi <> Do */
if ((hmsc->cbw.bmFlags & 0x80U) == 0x80U)
{
SCSI_SenseCode(pdev, hmsc->cbw.bLUN, ILLEGAL_REQUEST, INVALID_CDB);
return -1;
}
/* Check whether Media is ready */
if (((USBD_StorageTypeDef *)pdev->pUserData)->IsReady(lun) != 0)
{
SCSI_SenseCode(pdev, lun, NOT_READY, MEDIUM_NOT_PRESENT);
return -1;
}
/* Check If media is write-protected */
if (((USBD_StorageTypeDef *)pdev->pUserData)->IsWriteProtected(lun) != 0)
{
SCSI_SenseCode(pdev, lun, NOT_READY, WRITE_PROTECTED);
return -1;
}
hmsc->scsi_blk_addr = ((uint32_t)params[2] << 24) |
((uint32_t)params[3] << 16) |
((uint32_t)params[4] << 8) |
(uint32_t)params[5];
hmsc->scsi_blk_len = ((uint32_t)params[7] << 8) |
(uint32_t)params[8];
/* check if LBA address is in the right range */
if (SCSI_CheckAddressRange(pdev, lun, hmsc->scsi_blk_addr,
hmsc->scsi_blk_len) < 0)
{
return -1; /* error */
}
len = hmsc->scsi_blk_len * hmsc->scsi_blk_size;
/* cases 3,11,13 : Hn,Ho <> D0 */
if (hmsc->cbw.dDataLength != len)
{
SCSI_SenseCode(pdev, hmsc->cbw.bLUN, ILLEGAL_REQUEST, INVALID_CDB);
return -1;
}
len = MIN(len, MSC_MEDIA_PACKET);
/* Prepare EP to receive first data packet */
hmsc->bot_state = USBD_BOT_DATA_OUT;
USBD_LL_PrepareReceive(pdev, MSC_EPOUT_ADDR, hmsc->bot_data, len);
}
else /* Write Process ongoing */
{
return SCSI_ProcessWrite(pdev, lun);
}
return 0;
}
/**
* @brief SCSI_Verify10
* Process Verify10 command
* @param lun: Logical unit number
* @param params: Command parameters
* @retval status
*/
static int8_t SCSI_Verify10(USBD_HandleTypeDef *pdev, uint8_t lun, uint8_t *params)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *) pdev->pClassData;
if ((params[1] & 0x02U) == 0x02U)
{
SCSI_SenseCode(pdev, lun, ILLEGAL_REQUEST, INVALID_FIELED_IN_COMMAND);
return -1; /* Error, Verify Mode Not supported*/
}
if (SCSI_CheckAddressRange(pdev, lun, hmsc->scsi_blk_addr,
hmsc->scsi_blk_len) < 0)
{
return -1; /* error */
}
hmsc->bot_data_length = 0U;
return 0;
}
/**
* @brief SCSI_CheckAddressRange
* Check address range
* @param lun: Logical unit number
* @param blk_offset: first block address
* @param blk_nbr: number of block to be processed
* @retval status
*/
static int8_t SCSI_CheckAddressRange(USBD_HandleTypeDef *pdev, uint8_t lun,
uint32_t blk_offset, uint32_t blk_nbr)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *) pdev->pClassData;
if ((blk_offset + blk_nbr) > hmsc->scsi_blk_nbr)
{
SCSI_SenseCode(pdev, lun, ILLEGAL_REQUEST, ADDRESS_OUT_OF_RANGE);
return -1;
}
return 0;
}
/**
* @brief SCSI_ProcessRead
* Handle Read Process
* @param lun: Logical unit number
* @retval status
*/
static int8_t SCSI_ProcessRead(USBD_HandleTypeDef *pdev, uint8_t lun)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *)pdev->pClassData;
uint32_t len = hmsc->scsi_blk_len * hmsc->scsi_blk_size;
len = MIN(len, MSC_MEDIA_PACKET);
if (((USBD_StorageTypeDef *)pdev->pUserData)->Read(lun,
hmsc->bot_data,
hmsc->scsi_blk_addr,
(len / hmsc->scsi_blk_size)) < 0)
{
SCSI_SenseCode(pdev, lun, HARDWARE_ERROR, UNRECOVERED_READ_ERROR);
return -1;
}
USBD_LL_Transmit(pdev, MSC_EPIN_ADDR, hmsc->bot_data, len);
hmsc->scsi_blk_addr += (len / hmsc->scsi_blk_size);
hmsc->scsi_blk_len -= (len / hmsc->scsi_blk_size);
/* case 6 : Hi = Di */
hmsc->csw.dDataResidue -= len;
if (hmsc->scsi_blk_len == 0U)
{
hmsc->bot_state = USBD_BOT_LAST_DATA_IN;
}
return 0;
}
/**
* @brief SCSI_ProcessWrite
* Handle Write Process
* @param lun: Logical unit number
* @retval status
*/
static int8_t SCSI_ProcessWrite(USBD_HandleTypeDef *pdev, uint8_t lun)
{
USBD_MSC_BOT_HandleTypeDef *hmsc = (USBD_MSC_BOT_HandleTypeDef *) pdev->pClassData;
uint32_t len = hmsc->scsi_blk_len * hmsc->scsi_blk_size;
len = MIN(len, MSC_MEDIA_PACKET);
if (((USBD_StorageTypeDef *)pdev->pUserData)->Write(lun, hmsc->bot_data,
hmsc->scsi_blk_addr,
(len / hmsc->scsi_blk_size)) < 0)
{
SCSI_SenseCode(pdev, lun, HARDWARE_ERROR, WRITE_FAULT);
return -1;
}
hmsc->scsi_blk_addr += (len / hmsc->scsi_blk_size);
hmsc->scsi_blk_len -= (len / hmsc->scsi_blk_size);
/* case 12 : Ho = Do */
hmsc->csw.dDataResidue -= len;
if (hmsc->scsi_blk_len == 0U)
{
MSC_BOT_SendCSW(pdev, USBD_CSW_CMD_PASSED);
}
else
{
len = MIN((hmsc->scsi_blk_len * hmsc->scsi_blk_size), MSC_MEDIA_PACKET);
/* Prepare EP to Receive next packet */
USBD_LL_PrepareReceive(pdev, MSC_EPOUT_ADDR, hmsc->bot_data, len);
}
return 0;
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/